I can create the H.323 station in Avaya easily enough ( i was using a H.323 softphone), when connected and registered the Avaya’s gatekeeper will associate the extn number with the IP address (list registrations). I still have to play around abit more as i was getting a few errors but i hopefully will have these sorted out on Monday.
The stations were just added by doing add station XXXX and type H.323.
In terms of GVP, i was speaking to a genesys guy and he tells me that it would connect using H.323 trunks and not stations.
If i have some time i will dig up my gvp brain..and have a look.